#!/usr/bin/env python3
"""Check type_repr's C89 locals and preserve assignment/evaluation/control flow."""
import re
from pathlib import Path

source = Path("cpython/Objects/typeobject.c").read_text()
match = re.search(
    r"\nstatic PyObject \*\ntype_repr\(PyTypeObject \*type\)\n\{(.*?)\n\}",
    source,
    re.S,
)
assert match, "type_repr definition missing"
body = match.group(1)
assert re.match(r"\s*PyObject \*mod, \*name, \*rtn;\s*if\b", body), (
    "type_repr: PyObject *mod, *name, *rtn; must be in the opening declaration block"
)
assert body.count("PyObject *mod, *name, *rtn;") == 1, (
    "type_repr: declare mod, name, and rtn exactly once"
)
expected = """
    PyObject *mod, *name, *rtn;
    if (type->tp_name == NULL) {
        // type_repr() called before the type is fully initialized
        // by PyType_Ready().
        return PyUnicode_FromFormat("<class at %p>", type);
    }

    mod = type_module(type, NULL);
    if (mod == NULL)
        PyErr_Clear();
    else if (!PyUnicode_Check(mod)) {
        Py_DECREF(mod);
        mod = NULL;
    }
    name = type_qualname(type, NULL);
    if (name == NULL) {
        Py_XDECREF(mod);
        return NULL;
    }

    if (mod != NULL && !_PyUnicode_Equal(mod, &_Py_ID(builtins)))
        rtn = PyUnicode_FromFormat("<class '%U.%U'>", mod, name);
    else
        rtn = PyUnicode_FromFormat("<class '%s'>", type->tp_name);

    Py_XDECREF(mod);
    Py_DECREF(name);
    return rtn;
"""
assert body.split() == expected.split(), (
    "type_repr: preserve all assignments, evaluation order, and control flow"
)
print("type_repr locals C89 declaration and unchanged assignment/evaluation/control flow: PASS")